Ciel Phantomhive, a 13-year-old nobleman and Earl of Phantomhive, operates as the Queen’s Watchdog, unraveling criminal underworld plots in Victorian England. Born December 14, 1875, he is the surviving younger twin of the original Phantomhive heir. Following their parents’ murder on their tenth birthday, both brothers endured captivity by a demon-worshipping cult, suffering physical, mental, and sexual torment. During a ritual to summon a demon, the elder twin was sacrificed, prompting the younger to forge a Faustian contract with the summoned demon, Sebastian Michaelis, binding them in a quest for vengeance. Concealing his true identity, the survivor adopted his brother’s name and title, erasing his past. A pentagram seal beneath his right eyepatch marks his demonic pact, while a brand on his torso serves as a grim reminder of captivity. His striking bluish-black hair, deep blue eyes, and delicate frame contrast with his austere aristocratic attire. He carries two rings: a sapphire-adorned heirloom and a gold signet for official seals. Though hardened by trauma, his icy demeanor masks sharp intellect and strategic cunning. Driven by revenge, he occasionally reveals flickers of loyalty to allies like fiancée Elizabeth Midford and household staff. Tasked by the Queen during the Emerald Witch Arc, he investigates German forest deaths tied to a supposed curse. Dismissing superstition, he leverages the Phantomhive intelligence network—including ally Baron Diedrich—to confront a plague of physical deformities. Encounters with Sieglinde Sullivan, a witch descendant, expose fleeting vulnerability to the curse, yet his methodical resolve prevails. Subsequent arcs unravel secrets of his identity and Undertaker’s machinations. The Blue Memory Arc confirms his twin’s resurrection as a Bizarre Doll by Undertaker, sparking a clash that strips Ciel of his title and forces exile. Navigating moral ambiguity, he dismantles Undertaker’s corpse-sustaining blood farms, confronting both resurrected kin and his own trauma. Competitive and intolerant of failure, he favors sweets and refined tea, spurns spicy foods, and avoids cats due to allergies. Luxury is non-negotiable; hardship stirs disdain. Despite post-traumatic scars, his resilience anchors his navigation of political schemes and supernatural perils. His bond with Sebastian thrives on transactional pragmatism—a dance of manipulation and uneasy reliance.